solution of nonlinear equations in 3d

x_p, y_p, z_p=(4, 5, 2)

x_1, y_1, z_1=(8, 9, 5)

x_2, y_2, z_2=(2, 5, 1)

x_3, y_3, z_3=(6, 1, 3)

t_1=5.692820*10^-9

t_2=-2.924173*10^-9

t_3=-12.010097*10^-9

c=3.0*10^8

and my three equations are

eqn1 = sqrt((x(s)-x_p)^2+(y(s)-y_p)^2+(z(s)-z_p)^2)-sqrt((x(s)-x_1)^2+(y(s)-y_1)^2+(z(s)-z_2)^2)-(c*t_1)

eqn2 = sqrt((x(s)-x_p)^2+(y(s)-y_p)^2+(z(s)-z_p)^2)-sqrt((x(s)-x_2)^2+(y(s)-y_2)^2+(z(s)-z_2)^2)-(c*t_1)

eqn3 = sqrt((x(s)-x_p)^2+(y(s)-y_p)^2+(z(s)-z_p)^2)-sqrt((x(s)-x_3)^2+(y(s)-y_3)^2+(z(s)-z_3)^2)-(c*t_1)

where only x(s), y(s), z(s) are unknown are rest all are known

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[Ameer Hamza]

This is a duplicate of https://www.mathworks.com/matlabcentral/answers/601690-solution-of-3d-nonlinear-equation. Walter already gave an answer. Comment on that question if there is an issue. As you mentioned that there is an error, then also paste the error message.